Xiaochen Qiu, Daoming Guan, Xiaojing Xia, Huan Ling, Jialing Hu, Yunxiang Zhang, Emory Chan, Fuyou Li, Qian Liu. "Sub-10 nm upconversion nanocrystals for long-term single-particle tracking." Nature Communications, 2025. doi:10.1038/s41467-025-64180-w